TETRAHYDROFURAN POLYMERIZATION INITIATED WITH HETEROPOLYACID Ⅴ. DETERMINATION OF CONCENTRATION OF PROPAGATING SPECIES AND CHAIN PROPAGATION RATE CONSTANT

ZHANG Afang; ZHANG Guangli; ZHANG Hongzhi

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TETRAHYDROFURAN POLYMERIZATION INITIATED WITH HETEROPOLYACID Ⅴ. DETERMINATION OF CONCENTRATION OF PROPAGATING SPECIES AND CHAIN PROPAGATION RATE CONSTANT

Research Article | 更新时间：2021-03-19

- TETRAHYDROFURAN POLYMERIZATION INITIATED WITH HETEROPOLYACID Ⅴ. DETERMINATION OF CONCENTRATION OF PROPAGATING SPECIES AND CHAIN PROPAGATION RATE CONSTANT
- Acta Polymerica Sinica Issue 5, Pages: 568-572(2000)
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- Published：20 October 2000，
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ZHANG Afang, ZHANG Guangli, ZHANG Hongzhi. TETRAHYDROFURAN POLYMERIZATION INITIATED WITH HETEROPOLYACID Ⅴ. DETERMINATION OF CONCENTRATION OF PROPAGATING SPECIES AND CHAIN PROPAGATION RATE CONSTANT. [J]. Acta Polymerica Sinica (5):568-572(2000)
DOI：

ZHANG Afang, ZHANG Guangli, ZHANG Hongzhi. TETRAHYDROFURAN POLYMERIZATION INITIATED WITH HETEROPOLYACID Ⅴ. DETERMINATION OF CONCENTRATION OF PROPAGATING SPECIES AND CHAIN PROPAGATION RATE CONSTANT. [J]. Acta Polymerica Sinica (5):568-572(2000) DOI：

摘要

采用改进的酚钠法及端羟基测定法对环氧乙烷促进的低浓度磷钨杂多酸引发的四氢呋喃聚合反应过程中生长链浓度的测定表明

杂多酸分子中的三个质子均参与了引发反应

各引发一个聚合链 .采用醋酸酐为促进剂时杂多酸引发四氢呋喃聚合反应生长链浓度测定的结果也证明了这一点 .由此测得在0℃和20℃时四氢呋喃聚合反应链增长表观速率常数分别为 3.78×10-3和1.98×10-2 L·mol-1·s-1

这与四氢呋喃按离子型生长链增长时的反应速率常数相近 .说明PW12引发的THF聚合反应是通过氧鎓离子活性中心增长的

Abstract

Kinetic studies of tetrahydrofuran polymerization intiated by heteropolyacid showed that the concentration of propagating species maintained unchanged in the main period of the polymerization

indicating the absence of chain termination.The concentration of propagating species was measured by using a modified sodium phenoxide method and hydroxyl end-group analysis method

and it showed that each of the three protons in heteropolyacid initiated one chain.The same result was also verified for the acetic anhydride promoted system by the hydroxy end-group analysis method.The values of the chain propagation rate constant of THF polymerization at 0℃ and 20℃ were found to be 3.78×10-3and 1.98×10-2 L·mol·s1

respectively

which are in correspondence with the chain propagation rate constant of THF on ionic active species.

关键词

杂多酸四氢呋喃阳离子聚合反应动力学

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